Anyone build this sync adapter for Qbert?

I didnt build that one but I did build one for my qbert bench rig. I never could get qberts to sync up to my bench GO7 and this was the solution. I could build you one for pretty cheap.
 
Yeah, I've done stuff like this several times. It's dead simple. Making a printed board for this would be a complete waste of time, you can make this in ten minutes with a little Radio Shack perf board.

I've also built little sync inverters the same way, i.e., for using a new (composite negative sync) only monitor with Defender.

-Ian
 
Doesnt have to be bootleg. I couldnt get original boards to sync on my test monitor. It was a GO7 with a EYGO replacment chassis.
 
Doesnt have to be bootleg. I couldnt get original boards to sync on my test monitor. It was a GO7 with a EYGO replacment chassis.

I have never seen an EYGO replacement chassis, but I have a GO7 in my Q*bert running. Is there normally a problem getting them to sync up with GO7's?
 
I dont know, im sure the problem is an issue with the replacment chassis. From what I understand it was an aftermarket chassis offered back in the day. I tried every which way and never could get it to sync properly. I ran across the info on the net to build the sync combiner circuit and that cured the problem.
 
I tried Riptors adapter. It was made nice but does not work. So, I just ordered the parts for this sync adapter. I hope I ordered the right stuff...

48098 IC,74LS86
1946287 @ CAP,RADIAL,22uF,10V,20%
97893 @RESISTOR NET,10PIN,2.2KOHM,2%
97797 @RESISTOR NET,8PIN,2.2KOHM,2%
45145 IC,74HCT86 DIP


These parts were ordered from Jameco Electronics.
 
you probably could get one isolated resistor net (jameco 1971191) instead of two bussed resistor nets.

Also don't forget you will need some kind of connector to fit this into your monitor circuit.
 
Ancient thread I know, sorry };-P
Do anyone have the schematics for any og those 3 bootleg variations dezbaz mentions on his page? I'm sitting with an original that I'm repairing for a friend, and can't get it to sync with my test bench monitor. I wondered, if the hack with the pot could be done on an original as well?!
 
Ah ok, but would you know in what region of the board/schematics of an original the components would reside... the locations given in mikes how to is not on an original board.
You know if its 'close' to the 7407 where the 2 syncs are outputted?
I have btw just twisted v and h sync together and run them through a 74S04-inverter to get negative composite sync... Is there a better trick?
 
Ah ok, but would you know in what region of the board/schematics of an original the components would reside... the locations given in mikes how to is not on an original board.
You know if its 'close' to the 7407 where the 2 syncs are outputted?
I have btw just twisted v and h sync together and run them through a 74S04-inverter to get negative composite sync... Is there a better trick?

The only way to find this out is to follow the 2 boards and compare Orig to Bootleg

If the tracks go to the same ICs then they are the same.

I'm not being a smarty, it's literally what I would do.

I don't know about syncing, other than saying Q*bert has opposite sync polarity to JAMMA. I think Q*bert has positive sync.
I just followed AndysArcade's advice, and it worked
 
Hahaha! I know you're not just being "smarty"... You're one of the good guys };-P
And I would do precisely the same... But I haven't got a boot; only an original.
Have you still got the boot? And if so, could you maby take a photo of the hack installed with a bit of the surrounding area of PCB as well? I would be most grateful...
 
Hahaha! I know you're not just being "smarty"... You're one of the good guys };-P
And I would do precisely the same... But I haven't got a boot; only an original.
Have you still got the boot? And if so, could you maby take a photo of the hack installed with a bit of the surrounding area of PCB as well? I would be most grateful...

Yes, I have many boots :)

What do you need? :) Oops, I re-read and saw what you need - will do
 
You're a darling!
As many pics as possible of the area where the hack's installed... Both close-ups and overview. And maby also of the solder side of the same area.
Sometimes areas of originals and boots are precisely the same, just placed on different spots on the PCBs.
If there's too many pics to post here, I'll just pm you my email; just in case.

Thnx so much... M8! };-P
 
You're a darling!
As many pics as possible of the area where the hack's installed... Both close-ups and overview. And maby also of the solder side of the same area.
Sometimes areas of originals and boots are precisely the same, just placed on different spots on the PCBs.
If there's too many pics to post here, I'll just pm you my email; just in case.

Thnx so much... M8! };-P

I will post them here for all

I just had a hunt as the sun goes down here, looking for the Hacked board I did first (It's done as per Andysarcade.net's method) I did not find that version as yet
I have giant pizza boxes I use for board storage, so it can't be too hard to find :mad:

What I did find is 2 other bootlegs. One bootleg, unhacked, and one working, in my JAMMA Machine, with a different hack, but doing the same thing. As I say it's working.
It looks like it just uses resistors instead of an IC and pot etc.

Perhaps that would be an easier option for you?
 
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